<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <style type="text/css">
      .body {
        background: #FFFFFF;
      }
      .spinner
      {
        position: absolute;
        text-align: center;
        margin: auto;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        width: 100px;
        height: 100px;
      }
    </style>
  </head>
  <body>
    <div class="spinner">
      <canvas id="spinner" class="leaflet-progress-spinner-canvas"></canvas>
    </div>
    <script>
      var spinnerInterval = window.parent.L.LOUtil.startSpinner(document.getElementById('spinner'), 1.5);
    </script>
  </body>
</html>
